Air volume: 2500 - 44000 cfm Maximum SP: 0.75" wg. @ standard air densityFEATURES & BENEFITS6 bladed steel propellers bolted to a welded structural steel hub.All propellers are statically balanced.Bearings are pre-lubricated and installed in a pillow block housing.Bearings resilient mounted and rated L-50 life of 200, 000 hours.Heavy gauge steel housingframe construction.Welded frame assembly.Disconnect switch.Fan can operate in any position.OPTIONSHeavy duty damperWall boxRear guardWeather hoodWeather hood screen